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A006211 as a simple table

na(n)
10
20
31
42
54
68
716
832
964
10130
11264
12538
131104
142272
154692
169730
1720236
1842208
1988288
20185126
21389072
22819458
231729296
243655936
257742124
2616420928
2734879040
2874185364
29157986068
30336845482
31718988144
321536250336
333285674088
347033709954
3515070204524

[0,0,1,2,4,8,16,32,64,130,264,538,1104,2272,4692,
 9730,20236,42208,88288,185126,389072,819458,
 1729296,3655936,7742124,16420928,34879040,
 74185364,157986068,336845482,718988144,1536250336,
 3285674088,7033709954,15070204524]